Stress-Relieving Wristband
By Aarnav Sanghvi and Nikita Mehendale
Overview
Are you feeling your stress creep up on you? Don't know what to do? Try the heart rate sensor! This wearable device monitors your heart rate using an optic sensor and alerts you when your heart rate is too high with vibrations employed through a haptic motor. The device also includes a stress ball that you can use to release any pent-up stress!
Features
ESP32- C3-MINI Microcontroller for processing
A Photodiode and Green LED for measuring heart rate
Haptic Motor to actuate the warning sign to user
Powered by a 3V button battery
Adjustable wrist band for comfortable wearing
Schematic
Voltage Regulator
A Linear Voltage Regulator is used to step up 3V source to 3.3V to match powering needs of the ESP32
Photodiode and Haptic Motor Schematic
The signal coming from the photodiode is very minimal, so an amplifier is used to make the signal more readable.
Layout
3D Rendering
